The United States of America, also known as the United States or America, is a country primarily located in North America. It is a federal republic of 50 states and Washington, D.C., its federal capital district. The 48 contiguous states border Canada to the north and Mexico to the south, with the semi-exclavic state of Alaska in the northwest and the archip…The United States of America, also known as the United States or America, is a country primarily located in North America. It is a federal republic of 50 states and Washington, D.C., its federal capital district. The 48 contiguous states border Canada to the north and Mexico to the south, with the semi-exclavic state of Alaska in the northwest and the archipelagic state of Hawaii in the Pacific Ocean. Within the U.S. are 574 federally recognized tribal governments and 326 Indian reservations with tribal sovereignty rights. The U.S. asserts sovereignty over five major island territories and various uninhabited islands. It is a megadiverse country, with the world's third-largest land area and third-largest population, exceeding 340 million. Its three largest metropolitan areas are New York, Los Angeles, and Chicago, and its three most populous states are California, Texas, and Florida.
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